W Tungsten

Smells nice, too: The cyclodehydration of citral is achieved by using rhodium nanoparticles dispersed in an imidazolium-based ionic liquid. p-Cymene, p-α-dimethylstyrene, and limonene are obtained with selectivity greater than 75 %. The interaction between the imidazolium cations and the metal nanoparticles results in an acidic catalyst, which plays a similar function as a mineral acid but has a one order of magnitude higher activity.

The CO2 capture capacities for typical flue gas capture and regeneration conditions of two tertiary amidine N-methyltetrahydropyrimidine (MTHP) derivatives supported on activated carbon were determined through temperature-controlled packed-bed reactor experiments. Adsorption–desorption experiments were conducted at initial adsorption temperatures ranging from 29 °C to 50 °C with temperature-programmed regeneration under an inert purge stream. In addition to the capture capacity of each amine, the efficiencies at which the amidines interact with CO2 were determined. Capture capacities were obtained for 1,5-diazo-bicyclo[4.3.0]non-5-ene (DBN) and 1,8-diazobicyclo[5.4.0]-undec-7-ene (DBU) supported on activated carbon at a loading of approximately 2.7 mol amidine per kg of sorbent. Moisture was found to be essential for CO2 capture on the amidines, but parasitic moisture sorption on the activated carbon ultimately limited the capture capacities. DBN was shown to have a higher capture capacity of 0.8 mol CO2 per kg of sorbent and an efficiency of 0.30 mol CO2 per mol of amidine at an adsorption temperature of 29 °C compared to DBU. The results of these experiments were then used in conjunction with a single-site adsorption model to derive the Gibbs free energy for the capture reaction, which can provide information about the suitability of the sorbent under different operating conditions.The capture capacity of the molecular tertiary amidines 1,5-diazobicyclo[4.3.0]non-5-ene (DBN) and 1,8-diazobicyclo[5.4.0]undec-7-ene (DBU) is determined from packed-bed adsorption and desorption experiments. The role of humidity on the interaction of carbon dioxide with molecular tertiary amidines is studied, and used to develop a framework to estimate the feasibility of sorbents under alternate operating conditions.

This work describes the first report of the use of an aminosilicone solvent mix for the capture of CO2. To maintain a liquid state, a hydroxyether co-solvent was employed which allowed enhanced physisorption of CO2 in the solvent mixture. Regeneration of the capture solvent system was demonstrated over 6 cycles and absorption isotherms indicate a 25–50 % increase in dynamic CO2 capacity over 30 % MEA. In addition, proof of concept for continuous CO2 absorption was verified. Additionally, modeling to predict heats of reaction of aminosilicone solvents with CO2 was in good agreement with experimental results.The use of an aminosilicone solvent mix for the CO2 capture is described for the first time. To maintain a liquid state, a hydroxyether co-solvent is employed, enhancing physisorption of CO2. Regeneration of the capture solvent system is demonstrated over 6 cycles and absorption isotherms indicate a 25-50 % increase in dynamic CO2 capacity over 30 % MEA. In addition, a proof-of-concept for continuous CO2 absorption is verified.

Metal–organic frameworks (MOFs) are a fascinating class of crystalline nanoporous materials that can be synthesized with a diverse range of pore dimensions, topologies, and chemical functionality. As with other well-known nanoporous materials, such as activated carbon and zeolites, MOFs have potential uses in a range of chemical separation applications because of the possibility of selective adsorption and diffusion of molecules in their pores. We review the current state of knowledge surrounding the possibility of using MOFs in large-scale carbon dioxide separations. There are reasons to be optimistic that MOFs may make useful contributions to this important problem, but there are several critical issues for which only very limited information is available. By identifying these issues, we provide what we hope is a path forward to definitively answering the question posed in our title.Metal–organic frameworks are a fascinating class of crystalline nanoporous materials that can be synthesized with a diverse range of pore dimensions, topologies, and chemical functionality, and have potential uses in a range of chemical separation applications. This Minireview describes the current state of knowledge surrounding the possibility of using MOFs in large-scale carbon dioxide separations.

New EU Funding Calls, The Efficiency of Liquid Fuels, and Graphene in Your Cellphone

The cover is a depiction of the way in which the chemical sciences are tackling the challenges associated with carbon capture and sequestration (CCS), from molecule discovery through process development. In this special issue dedicated to CCS, guest editors Christopher W. Jones (Georgia Tech) and Edward J. Maginn (Notre Dame) have collected an array of invited and contributed papers that address the challenges of CCS, with a strong emphasis on carbon capture. The issue includes 13 contributions, including 2 Minireviews, 1 Communication, and 10 Full Papers.